ASoC: mdm9625: Add support for Multimedia2 session

Add Multimedia2 session support in DAI link for MDM9625.
Multimedia2 is used for playback and recording of PCM similar
to Multimedia1 session.

CRs-fixed: 462489
Change-Id: Ibdc3c4f3f8ec1776036f61c8847609724ef29623
Signed-off-by: Venkat Sudhir <vsudhir@codeaurora.org>